[Tutor] how to unique the string

[Peter Otten]

lina wrote:

>>> tobetranslatedparts=line.strip().split()

strip() is superfluous here, split() will take care of the stripping:

>>> " alpha \tbeta\n".split()
['alpha', 'beta']

>>> for residue in results:
>>>     if residue not in unique:
>>>         unique[residue]=1
>>>     else:
>>>         unique[residue]+=1

There is a dedicated class to help you with that, collections.Counter:

>>> from collections import Counter
>>> results = ["alpha", "beta", "gamma", "alpha"]
>>> unique = Counter(results)
>>> unique
Counter({'alpha': 2, 'beta': 1, 'gamma': 1})

Counter is a subclass of dict, so the stuff you are doing with `unique` 
elswhere should continue to work.

> This part I just wish the output in file like:
> 
> {'26SER': 2, '16LYS': 1, '83ILE': 2, '70LYS': 6}
> 
> as
> 
> 26SER 2
> 16LYS 1
> 83ILE 2
> 70LYS 6

You can redirect the output of print() to a file using the `file` keyword 
argument:

>>> unique = {'26SER': 2, '16LYS': 1, '83ILE': 2, '70LYS': 6}
>>> with open("tmp.txt", "w") as f:
...     for k, v in unique.items():
...             print(k, v, file=f)
...
>>>
$ cat tmp.txt
26SER 2
83ILE 2
70LYS 6
16LYS 1
$